Bidding Announcement Of: Secretariat Of State For Environment. Object: Services Contract For Support For The Management Of Sand Contribution Works And Improvement Of Sediment Retention Devices On The Beach Of Matalascañas. T.M. Almonte (Huelva), Within The Framework Of The Recovery, Transformation And Resilience (Prtr) Plan. File: P02.C05.I04.P01.90.E2.